Richard watkins-and john dickson



(No Model.) t R. WATKINS &'J. DIGKSON.

, 1 WATER TUBBBOILEIR. No. 412,438. Patented Oct.- 8, 1 889.

. to water-tube boilers.

UNITED v STATES PATENT OFFICE.

RICHARD WATKINS-AND J OHN'DIOKSON, OF NEW YORK, N. Y.

WATER-TUBEBOILER.

SPECIFICATION formingpart of Letters 'Patent No. 412,438,,dated October8, 1889. Application filed July 6, 1889- Serial No. 316,715. (N model.)

To all whom it may concern:

Be it known that we, RICHARD WA'rKms and JOHN DIOKSON, citizens of theUnited States, residing at New York city, in the county'of New York andState of New York, have invented certain new and useful Improvements inWater-Tube Boilers; and we do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertainsto make and use the same,reference being had to the accompanying drawings, and to the letters andfigures of reference marked thereon, which form a part of thisspecification.

Our invention relates generally to stationary land and marine boilers,but particularly We will first describe the invention in connection withthe drawings, and then point it out in the claim.

Figure 1 of the drawings is an elevation in longitudinal section; Fig.2, a vertical crosssection, and Fig. 3 a detail view showing thecorrugation of the boiler metal.

In the drawings, A represents the boiler as an entirety; B, the returnfire-tubes; O O, the horizontal fire-fines; c, the water-tubes runningfrom the front head a to the back head a, through said flues, the headsan, being tapped to receive the brass plugs D, which are opposite thetube-end holes where they open into the water-space.

E represents the furnace-chamber, divided by a water-leg or partition E,and provided with the usual grate-bars e, fire-doors c, and bridge-wallF in each division. In addition to the usual bridge-wall F,'we makeanother wall F, extending down from the upper part of each flue 0, justwhere the water-tubes 0 enter the chamber G, in which the products ofcombustion rise to enter the return-tubes B, and thence pass outthroughthe uptake H. The function of the wall F is to deflect the products ofcombustion downwardly. and thus cause them to dwell longer among thewatertubes and part with more of their heat.

The watenspace I surrounds the fire-place of the boiler and ext endsinto the legs h h and partition-leg E.

r J K L are man-holes to allow access to the interior of theboiler forthe purpose of cleaning it out, and M a steam-drum connecting with thesteam-space of the boiler by means of the necks m.

lVe are well acquainted with the boiler described in Patent No. 348,315,granted to Burrows, August 31, 1886; but it has only one large furnaceand that one in the large flue. Hence the water-tubes are crowded downinto the fuel, while the fire comes into such close contact. with thewater-tubes that the water is liable to be driven out and the tubes tobe burned. There is also found to be insufficient room in this boilerfor fire thick-.

ness and for grate-surface. In order to remove these objections, we havemade two independent furnaces, each with its own fire-door, so that onemay be cleaned out 'while the other is in full operation, thuspreventing the admission of cold air to the heating-surface of all thetubes. Our construction also avoids the crowding of thewater-tubes downinto the fire, so that the water in our tubes is not liable to be drivenout and the tubes to be burned. In order to render unnecessary the usualbracing against collapsing pressure,we corrugate the lines 0, as shownin Fig. 3 of the drawings, thereby also increasing the heatingsurface.

What we claim as new, and desire to protect by Letters Patent, is

A steam-boiler having the lower part divided by a water-leg partitioninto two compartments, and having in each of these compartments aseparate furnace,a separate fireflue, and the water-tube c, the latterrunning through said lines from head a to head a, as and for the purposeset forth.

In testimony whereof we affix our signatures in presence of twowitnesses.

RICHARD WATKINS. JOHN DICKSON. Witnesses:

Josnrrr CoNRoN, WM. J. HELME.

